|Publication number||US5174618 A|
|Application number||US 07/806,011|
|Publication date||Dec 29, 1992|
|Filing date||Dec 9, 1991|
|Priority date||Dec 9, 1991|
|Also published as||CA2070008A1, CA2070008C|
|Publication number||07806011, 806011, US 5174618 A, US 5174618A, US-A-5174618, US5174618 A, US5174618A|
|Inventors||Keith E. Kropf|
|Original Assignee||Maytag Corporation|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (17), Referenced by (26), Classifications (17), Legal Events (8)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates to a door latch assembly, and particularly to a door latch assembly for use with a dishwashing machine.
Dishwashing machines conventionally include a tub forming an interior washing chamber. A door opening is provided in the tub, and a door is attached to the door opening and hinged at its lower edge for movement between open and closed positions. The upper edge of the door latches to the door frame for holding the door in sealed closure over the door opening.
The door of the dishwasher contains a control panel adjacent its upper end, and within this control panel is electrical circuitry for controlling the operation of the dishwasher. For proper operation the dishwasher should be capable of being placed in an operable condition only during the time that the door is latched, but in an inoperable condition at all times when the door is unlatched. Therefore, the latch assembly should be capable of simultaneously latching the door and placing the control circuitry for the dishwasher in an operable state. When the latch assembly is unlatched, the latch assembly should at the same time disconnect the control circuitry so that the dishwasher will stop operating. Stopping the operation of the machine when the door is unlatched is important to prevent hot water from being sprayed or splashed upon the person opening the door.
Certain problems have been encountered in developing satisfactory door latch assemblies for dishwashers. One difficulty is designing a door latch assembly which occupies a minimum of space so that it can be easily mounted within the interior panels of the door. Another problem is the need for a door latch assembly which provides a positive reliable latching mechanism, while at the same time providing a positive reliable means for connecting and disconnecting the power system of the dishwasher.
One example of a prior latch assembly is shown in U.S. Pat. No. 4,776,620. This device utilizes a cantilevered leaf spring which is attached at one end to the door frame. The leaf spring engages a fixed bolt mounted within the dishwasher door and deflects while camming over the fixed bolt to the latch position. In the latch position, the cantilever spring also engages switches which actuate the power system for the dishwasher when the door is latched. A latch handle on the door is operable to disengage the latch and simultaneously disengage the latch from the switches so that the switches are rendered in an open position, thereby deactuating the power system of the dishwasher.
One disadvantage of the cantilever spring latch mechanism is the variable spring constant inherent in this type of spring. The force exerted on the end of the spring is variable during its travel. Consequently, this type of latch requires a switch which can be placed in a closed condition in response to a lower spring force. Typically, switches capable of responding to lower forces also must be of a reduced power rating.
Another disadvantage of the device shown in U.S. Pat. No. 4,776,620 is that this latch includes a pivoting handle which requires more space front to back and which affects the handle force and travel. It is desirable to provide a more compact handle which slides in a linear direction and which has a one-to-one force and distance relationship.
Therefore, a primary object of the present invention is the provision of an improved door latch assembly, particularly a door latch assembly for a dishwashing machine.
A further object of the present invention is the provision of an improved door latch assembly which utilizes a spring mounted, pivoting strike member.
A further object of the present invention is the provision of an improved door latch assembly which includes a spring mounted strike member which has an approximately constant force applied to it throughout its distance of travel between its latch and unlatch position.
A further object of the present invention is the provision of an improved door latch assembly which uses a minimum of space within the panels of the doors.
A further object of the present invention is the provision of an improved door latch assembly which is capable of providing a greater force to the end of the strike member than in prior devices.
A further object of the present invention is the provision of an improved door latch assembly which utilizes a sliding handle as opposed to a pivoting handle and which provides a one-to-one force and distance relationship.
A further object of the present invention is the provision of an improved door latch assembly which is economical to manufacture, durable in use, and efficient in operation.
The present invention achieves these objects with an improved door latch assembly for use with an appliance having a cabinet, a door opening provided in the cabinet, and a door hinged to the cabinet and moveable from a closed position in covering relationship over the door to an open position. In one embodiment of the invention a strike member is pivotally mounted to the door frame and is adapted to engage a fixed bolt on the door when the door is in its closed position. The strike member is spring mounted by means of a torsion spring so that it pivots between a latch position and an unlatch position. The torsion spring urges the strike member toward its latch position.
In a second embodiment of the invention, the strike member is integral with the torsion spring and is formed from a U-shaped extension of the torsion spring. This U-shaped portion of the torsion spring is adapted to engage the fixed bolt of the door.
The fixed bolt is mounted to the door and includes a ramp surface and a latching shoulder. As the door is closed, the strike member engages the ramp surface of the bolt and rides over the bolt and is forced downwardly by the torsion spring into engagement with the latching shoulder on the bolt. This latches the door positively in its closed position.
A pair of electrical switches are mounted within the panels of the door and are connected to the power system for the dishwasher. The switches are normally in an open position which prevents actuation of the power system for the dishwasher. However, they include moveable switch members which are spring mounted and which can be yieldably moved to change each switch from an open position to a closed position so as to actuate the power system of the dishwasher.
A door handle is slidably mounted within the panels of the door and is engagable with the switch members. The door handle is vertically slidable from a first position, wherein the switch members are permitted to remain in their open position to a second position, wherein the switch members are depressed and held in their closed position.
The positioning of the door handle is such that the door handle is engaged by the strike member during the time that the strike member cams over the fixed bolt and moves downwardly into engagement with the latching shoulder of the bolt. As the strike member moves downwardly, it engages the handle and forces the handle downwardly, thereby causing the switch members to be moved into their closed position. This permits actuation of the power system for the dishwasher only when the door is in its latch position.
When the door is opened, the handle is lifted upwardly, thereby disengaging the strike member from the latching shoulder of the fixed bolt and simultaneously permitting the spring mounted switch members to move upwardly and place the switches in an open position. This deactuates the power system for the dishwasher and prevents the dishwasher from continuing to operate when the door is unlatched.
The use of a pivotally mounted strike member and the use of a torsion spring for urging the strike member to its latch position results in a substantially constant force being applied to the end of the strike member throughout its movement from its unlatch to its latch position. Furthermore, it is possible to apply a greater force of at least two pounds to the strike member by the use of this arrangement.
The ability to bring a greater force to bear at the end of the strike member also permits the use of switches of higher power ratings. For example, with a force which exceeds two pounds, it is possible to use switches which have 25 amp ratings.
The use of a sliding handle, as opposed to a pivoting handle used in prior devices, permits the more efficient use of space between the panels of the door and also affects the relationship of the force and travel relationship needed for moving the handle to disengage the latch. There is a one-to-one force and distance relationship with the use of this sliding handle.
FIG. 1 is a perspective view of a dishwasher mounted beneath a counter.
FIG. 2 is an exploded perspective view of the latch assembly of the present invention.
FIG. 2A is an exploded perspective view of the strike assembly, 58 of the present invention.
FIG. 2B is an exploded perspective view of the handle and the bolt frame, showing the opposite side from that shown in FIG. 2.
FIG. 3 is a sectional view of the door and latch assembly, showing the latch assembly in its latch position.
FIG. 4 is a view similar to FIG. 3, but showing the latch assembly in its intermediate position.
FIG. 5 is a view similar to FIG. 4, but showing the door unlatched.
FIG. 6 is a sectional view taken along line 6--6 of FIG. 3.
FIG. 7 is an enlarged sectional view taken along line 7--7 of FIG. 3.
FIG. 8 is a sectional view taken along line 8--8 of FIG. 3.
FIG. 9 is a sectional view taken along line 9--9 of FIG. 4.
FIG. 10 is a sectional view taken along line 10--10 of FIG. 9.
FIG. 11 is a sectional view showing the inside of one of the switches used in the present invention.
FIG. 12 is a sectional view taken along line 12--12 of FIG. 11.
FIG. 13 is a perspective view of a modified form of the strike assembly of the present invention.
Referring to the drawings, the numeral 10 generally designates a dishwasher which is installed beneath a counter 12. Dishwasher 10 includes a removable access door 14 and a hinged door 16 which is hinged adjacent its lower edge 18 for pivotal movement about a horizontal axis. The upper edge 20 of door 16 includes a control panel 22 having a handle opening 24 therein. Door 16 includes an outer door panel 26 and an inner door panel 28 which are fitted together to provide a sealed insulation compartment 29 therein. Extending around the perimeter of the inner panel 28 is a sealing rim 30.
Control panel 22 forms a controller compartment 32 in which are housed numerous electrical components for controlling the power system and the operation of the dishwasher. The door 16 is adapted to close a door opening 34 (FIGS. 3-5) which is framed by a door frame 36. In cross section door frame 36 includes a vertical flange 38, an inwardly extending flange 40, and a channel 42 which surrounds the door opening 34. Fitted within channel 42 is an elastomeric seal 44 which is adapted to be engaged by sealing rim 30 (FIGS. 3 and 4) when the door is in its closed position.
Extending around the top and side walls of the dishwasher is a collar 46 which is shown in cross section in FIGS. 3-5. Mounted to collar 46 is a Z-bracket 48 having horizontal flanges 50, 52 which are interconnected by a vertical web 54. Rivets or bolts 56 secure the Z-bracket to the collar 46.
Mounted to the horizontal flange 52 of Z-bracket 48 is a strike assembly 58. Strike assembly 58 is shown in detail in FIGS. 2 and 2A, and includes a strike bracket 60, a strike member 68, and a torsion spring 84. Bracket 60 is comprised of a horizontal plate 62 having a pair of spaced apart curved sleeves 64 with notches 66 therein. Mounted to strike bracket 60 is strike member 68 which contains a T-shaped end formed by a T-cross bar 70 and a T-leg 72. On opposite sides of the T-leg 72 are a pair of notches 74. As can be seen in FIGS. 3-7, the T-cross bar 70 includes a first inclined edge 76 and a second inclined edge 78. A central hole 80 extends through the strike member 68, and a pair of oppositely extending pivot pins 82 extend outwardly from the strike member 68.
Strike member 68 is secured to strike bracket 60 by means of torsion spring 84 which includes a pair of coils 86, a pair of opposite ends 88, and an intermediate U-shaped portion 90 extending between the two coils.
As can be seen in FIG. 2, the strike assembly 58 is mounted with the opposite ends 88 of spring 84 fitted within the notches 66 of curved sleeves 64. The pivot pins 82 of strike member 68 are fitted within the centers of coils 86 and within the sleeves 66. The U-shaped portion 90 of torsion spring 84 extends over the top of strike member 68. The resulting combination causes the strike member 68 to be pivotally mounted to the strike bracket 60 for pivotal movement about the axis formed by pins 82. The torsion spring 84 causes the strike member 68 to be yieldably urged in a counterclockwise direction (as viewed in FIG. 2) between a latch position shown in FIG. 3 and an unlatch position shown in FIGS. 4 and 5.
Strike assembly 58 is mounted to the door frame 36 and to the horizontal flange 52 of Z-bracket 48 by means of a mounting screw 92 as shown in FIGS. 3-5. The vertical flange 38 of door frame 36 includes an opening 94 through which strike member 68 extends.
Mounted within the controller compartment 32 is a bolt frame 96 (FIG. 2) which is preferrably molded from plastic. Bolt frame 96 includes a rectangularly shaped strike receptacle 98 having a T-shaped opening 100 (FIG. 2B) extending therethrough. A fixed bolt is formed by an inclined bolt ramp 102 and a latch shoulder 104. Within latch shoulder 104 is a centrally located notch 106.
Bolt frame 96 is also shaped to form a pair of switch receptacles 108 having switch snaps 110 adjacent thereto. Fitted within these receptacles 108 are a pair of switches 112 which are of conventional construction and which include a switch plunger 114 and a pair of electrical connectors 116, 118. These switches may vary according to design choice, but preferrably they are rated for at least 25 amperes. The switch snaps 110 hold the switches in place within switch receptacles 108.
The internal structure of switches 112 is shown in FIGS. 11 and 12. Each switch 112 comprises an outer housing 150. Within the housing 150 is a vertical leg 152 of connector 118. Surrounding leg 152 is a spring contact 154 having a central toggle member 156 with a contact point 158 adapted to engage a contact point 160 on the inner end of connector 116. The inner end of central toggle member 156 is fitted within a notch 162 in the vertical leg 152 of connector 118. A cam member 164 is fitted between two spaced apart spring arms 166 of spring contact 154 and fits in covering relation over a cross member 168 so that downward depression of switch plunger 114 causes downward movement of cam member 164 and also causes downward movement of spring arms 166. The spring arms 166 yieldably urge the cam member and the switch plunger 114 upwardly to their extreme upper most positions. However, continued downward movement of plunger 114 against the spring bias provided by spring arms 166 causes the toggle member 156 to be pushed over center so that contact 158 moves from its normal open position shown in FIG. 11 to a closed position (shown in shadow lines), wherein contact 158 engages contact 160 thereby completing the power circuit for the dishwasher. However, if downward pressure on plunger 114 is released, the spring arms 166 cause the cam 164 and the plunger 114 to again move to their upper most position thereby causing the contact 158 to be sprung upwardly out of contact with the contact 160. Thus, the contacts 158, 160 are normally in an open circuit condition, and are only closed when the plunger 114 is pressed downwardly against the bias provided by spring arms 166.
The outer most face of the bolt frame 96 is shown in FIG. 2B and includes a vertical guide collar 120 which is adapted to slidably receive a vertical guide channel 122 of an opening handle 124. Handle 124 comprises a vertical plate 126, a horizontal grasping flange 128, and a mounting flange 130 which forms a mounting channel 132 in combination with vertical plate 126. Extending along the lower edge of vertical plate 126 is a drainage channel 134, and protruding downwardly therefrom are a pair of spaced apart plunger stubs 136.
Handle 124 is slidably mounted to bolt frame 96 by inserting channel 122 into the guide collar 120. As seen in FIG. 10, the handle snaps 138 in bolt frame 96 snap inwardly to provide a vertical limit to the sliding movement of handle 124 within the collar 120. The plunger stubs 136 of handle 124 are in registered alignment above switch plungers 114 as can be seen in FIGS. 8 and 9 so that movement of the handle from its upper position shown in FIG. 9 to its lower position shown in FIG. 8 causes the plunger stubs 136 to depress the switch plungers 114. Switches 112 are normally in an open position, and the plungers 114 are held in their upper most position by a plunger spring (not shown) which is within the switch 112. In this open position, the switches prevent actuation of the power circuit of the dishwasher. However, when the handle 124 is depressed from the position shown in FIG. 9 to the position shown in FIG. 8, it causes the plungers 114 to be depressed also, and changes the configuration of the switches to a closed circuit condition, thereby permitting actuation of the power circuit for the dishwasher.
Bolt frame 96 and handle 124 are secured together and then are mounted within the controller compartment 32 of door 16 as shown in FIGS. 3-5. In this position, the screw mounting holes 140 (FIG. 2) are used to receive bolts or screws (not shown) to mount the bolt assembly 96 in place. In this position, the strike receptacle 98 is matingly inserted within an opening 99 in the internal face of panel 28 of door 16.
FIG. 13 illustrates a modified form of the strike member designated by the numeral 170. In this modified form 170, the strike member is made integral with the torsion spring rather than as a separate part as shown in FIG. 2. The strike member 170 comprises a pair of torsion spring coils 172 which have coil ends 174 fitted within the notches 66 of the curved sleeves 64. Extending upwardly from the spring coils 172 are a pair of side members 182 which are shaped at their outer end into a T-cross bar 176 having a T-leg 178 and having a pair of spaced apart notches 180. The T-cross bar 176 and the notches 180 are adapted to engage the inclined bolt ramp 102 and ultimately provide the same function as T-cross bar 70 and T-leg 72 of strike member 68 shown in FIG. 2.
The operation of the latch assembly is illustrated in FIGS. 3-5. FIG. 5 shows the door in an unlatch position. In this position, torsion spring 84 urges the outer most end of T-cross bar 70 to its lower most or latch position. As the door is closed, the first inclined edge 76 of strike member 68 encounters the bolt ramp 102 and cams upwardly. This causes the strike member 68 to be cammed up to its unlatch position shown in FIG. 4. Continued closing movement of the door causes the second inclined edge 78 of T-cross bar 70 to ride upwardly over latching shoulder 104, thereby permitting the strike member to pivot downwardly from its unlatch position shown in FIG. 4 to its latch position shown in FIG. 3. As can be seen in FIG. 3, the second inclined edge 78 of T-cross bar 70 engages the latch shoulder 104 which is inclined in the opposite direction so that the two cooperate together to cause a camming action therebetween urging the strike member downwardly to its extreme lower most latch position shown in FIG. 3. This downward movement is further helped by the yieldable force exerted by torsion spring 84.
As can be seen in FIGS. 3, 4, and 7, the T-cross bar 70 of strike member 68 also engages the upper edges 144 of a pair of vertical ribs 146 which are integrally formed with the handle 124. Thus, as the strike member moves from its unlatch position shown in FIG. 4 to its latch position shown in FIG. 3, it also urges the handle 124 downwardly from its upper most position to its lower most position, thereby simultaneously causing the depression of the switch plungers 114 from their extended position shown in FIG. 9 to their retracted position shown in FIG. 8. This causes the switches 112 to be placed in a closed condition, thereby actuating the power system of the dishwasher. From this construction, it can be seen that the power system of the dishwasher is only actuated when the door is in its latch position with the strike member 68 holding the handle 124 and the switch plungers 114 in their lower most position. Thus, the handle 124 and the plungers 114 provide an intermediary actuating mechanism for transferring motion from the strike member 68 to the switches 112 to actuate the switches.
When it is desired to open the door, the operator's hand engages the horizontal grasping flange 128 and urges it upwardly from the position shown in FIG. 3 to the position shown in FIG. 4. This causes lifting of the strike member 68 from its lower most latch position to its upper most unlatch position, and also lifts the plunger stubs 136 from the position shown in FIG. 8 to the position shown in FIG. 9, thereby permitting the plungers 114 to spring upwardly and changing the switches 112 to their open condition. Thus, before the door latch is released, the switches are turned to an open condition, and the power system for the dishwasher is shut off. Once the handle has been raised to the position shown in FIG. 4, the strike member is free to slide outwardly from the door to the position shown in FIG. 5 and the door may be open. In this condition, the strike member 68 again springs downwardly to its latch position as shown in FIG. 5.
Several important advantages are obtained with the present invention. The use of a torsion spring to urge the strike member 68 downwardly results in a nearly constant force being applied to the outer end 70 of the strike member throughout movement from its upper most unlatch position to its lower most latch position. Furthermore, a greater force can be applied by use of the torsion spring than can be achieved with other types of springs such as leaf springs. The force which can be applied has been found to be greater than two pounds which permits larger switches to be used since typically the larger the rating of the switch, the greater the spring resistance of the plungers 114. It has been found that switches having ratings as high as 25 amperes can be utilized with the present invention. Switches with 25 ampere ratings have spring mounted plungers which are overcome by the downward force exerted by the two pounds resulting from the use of the torsion spring.
An advantage is obtained by the utilization of a vertically slidable handle rather than a pivoted handle as in many prior devices. The vertical sliding movement of handle 124 minimizes the front to back space required within the controller compartment 32. Furthermore, a linear relationship is established between the force required to move the handle 124 from its upper most position to its lower most position. The force to distance ratio is approximately one to one.
The switches 112 are protected from inadvertent splashing of water or washing fluid into the T-shaped opening 100 of strike receptacle 98. This is achieved by use of the drainage channel 134 and handle 124 which diverts water outwardly away from the switches. Also, a pair of dams 148 are provided in bolt frame 96 (FIG. 2B) for preventing inadvertent flowing of water inwardly toward the switches 112.
The preferred embodiment of the invention has been set forth in the drawings and specification, and although specific terms are employed, these are used in a generic or descriptive sense only and are not used for purposes of limitation. Changes in the form and proportion of parts as well as in the substitution of equivalents are contemplated as circumstances may suggest or render expedient without departing from the spirit or scope of the invention as further defined in the following claims.
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|U.S. Classification||292/254, 292/DIG.69|
|International Classification||E05C19/06, E05C3/16, E05B63/00, E05B17/22, A47L15/42|
|Cooperative Classification||Y10T292/18, Y10S292/69, A47L15/4259, E05C19/06, E05B17/22, E05B63/0052, E05C3/16|
|European Classification||A47L15/42J6A, E05B17/22, E05C3/16|
|Jan 13, 1992||AS||Assignment|
Owner name: MAYTAG CORPORATION A DE CORPORATION, IOWA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KROPF, KEITH E.;REEL/FRAME:005970/0247
Effective date: 19911209
|Jan 4, 1994||CC||Certificate of correction|
|Mar 8, 1994||CC||Certificate of correction|
|May 6, 1996||FPAY||Fee payment|
Year of fee payment: 4
|Jul 28, 1997||AS||Assignment|
Owner name: HOOVER HOLDINGS INC., OHIO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MAYTAG CORPORATION;REEL/FRAME:008628/0670
Effective date: 19970718
|Aug 25, 1997||AS||Assignment|
Owner name: ANVIL TECHNOLOGIES LLC, OHIO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HOOVER HOLDINGS INC.;REEL/FRAME:008669/0526
Effective date: 19970718
|Apr 17, 2000||FPAY||Fee payment|
Year of fee payment: 8
|Apr 22, 2004||FPAY||Fee payment|
Year of fee payment: 12